posted by anthony .
in a downhill race a skier slides down a 40 degree slope. starting from rest how far must he slide down the slope to reach a speed of 130 km/hr. ignore air friction and assume the co effiecnt of kinetic friction between skies and snow is .1
but force net= mg*CosTheta-friction
net force= mg*cosTheta-mu*mg*SinTheta
set that equal to ma, solve for a.
Now, knowing a
Vf^2=Vi^2+2ad solve for distance d.
put velocities in m/s